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From: Adrian Hunter <adrian.hunter@intel.com>
To: Baolin Wang <baolin.wang@linaro.org>,
	ulf.hansson@linaro.org, zhang.lyra@gmail.com,
	orsonzhai@gmail.com
Cc: vincent.guittot@linaro.org, linux-mmc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] mmc: host: sdhci-sprd: Fix the incorrect soft reset operation when runtime resuming
Date: Wed, 17 Jul 2019 09:07:05 +0300	[thread overview]
Message-ID: <66eb3053-ca2d-e2f0-edf0-9227f75a5693@intel.com> (raw)
In-Reply-To: <89c3ef495c367d58ca3abe99a1f82c48f8c08705.1563274904.git.baolin.wang@linaro.org>

On 17/07/19 5:28 AM, Baolin Wang wrote:
> In sdhci_runtime_resume_host() function, we will always do software reset
> for all, which will cause Spreadtrum host controller work abnormally after
> resuming.
> 
> Thus for Spreadtrum platform that will not power down the SD/eMMC card during
> runtime suspend, we should not do software reset for all. To fix this
> issue, adding a specific reset operation that adds one condition to validate
> the power mode to decide if we can do software reset for all or just reset
> command and data lines.
> 
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
> Changess from v3:
>  - Use ios.power_mode to validate if the card is power down or not.
> 
> Changes from v2:
>  - Simplify the sdhci_sprd_reset() by issuing sdhci_reset().
> 
> Changes from v1:
>  - Add a specific reset operation instead of changing the core to avoid
>  affecting other hardware.
> ---
>  drivers/mmc/host/sdhci-sprd.c |   19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index 603a5d9..94f9726 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -373,6 +373,23 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
>  	return 1 << 31;
>  }
>  
> +static void sdhci_sprd_reset(struct sdhci_host *host, u8 mask)
> +{
> +	struct mmc_host *mmc = host->mmc;
> +
> +	/*
> +	 * When try to reset controller after runtime suspend, we should not
> +	 * reset for all if the SD/eMMC card is not power down, just reset
> +	 * command and data lines instead. Otherwise will meet some strange
> +	 * behaviors for Spreadtrum host controller.
> +	 */
> +	if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) &&
> +	    mmc->ios.power_mode == MMC_POWER_ON)
> +		mask = SDHCI_RESET_CMD | SDHCI_RESET_DATA;
> +
> +	sdhci_reset(host, mask);
> +}
> +
>  static struct sdhci_ops sdhci_sprd_ops = {
>  	.read_l = sdhci_sprd_readl,
>  	.write_l = sdhci_sprd_writel,
> @@ -381,7 +398,7 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
>  	.get_max_clock = sdhci_sprd_get_max_clock,
>  	.get_min_clock = sdhci_sprd_get_min_clock,
>  	.set_bus_width = sdhci_set_bus_width,
> -	.reset = sdhci_reset,
> +	.reset = sdhci_sprd_reset,
>  	.set_uhs_signaling = sdhci_sprd_set_uhs_signaling,
>  	.hw_reset = sdhci_sprd_hw_reset,
>  	.get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
> 


  reply	other threads:[~2019-07-17  6:08 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-17  2:28 Baolin Wang
2019-07-17  6:07 ` Adrian Hunter [this message]
2019-07-22 11:54 ` Ulf Hansson
2019-07-23  3:05   ` Baolin Wang
2019-07-23  3:21     ` Chunyan Zhang
2019-07-23  3:30       ` Baolin Wang
2019-07-23 12:38     ` Ulf Hansson
2019-07-24  2:21       ` Baolin Wang
2019-07-24 12:55         ` Adrian Hunter
2019-07-25  3:05           ` Baolin Wang

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